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This question already has an answer here:

I think the title is self-explanatory but should I make the connection on PCB or they are already connected? If so, should I still connect them externally? Why?

I'm working on ATMEGA328p-pu if it matters.

atmega

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marked as duplicate by m.Alin, PeterJ, Ricardo, Majenko, Vladimir Cravero Feb 5 '15 at 13:29

This question has been asked before and already has an answer. If those answers do not fully address your question, please ask a new question.

  • \$\begingroup\$ Not the same, but thx. Now I already know that I must connect them, but still not if they're internally connected. \$\endgroup\$ – Pedro Quadros Feb 5 '15 at 12:25
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    \$\begingroup\$ As Olin says in the link, it's really hard to say - whether or not there's an internal connection probably depends on the chip. \$\endgroup\$ – Greg d'Eon Feb 5 '15 at 12:37
  • \$\begingroup\$ So, should I delete the topic? \$\endgroup\$ – Pedro Quadros Feb 5 '15 at 12:42
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    \$\begingroup\$ Whether they are internally connected or not is not your concern. You need to connect them both anyway, so what does it matter if they are internally connected or not? \$\endgroup\$ – Majenko Feb 5 '15 at 13:01
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    \$\begingroup\$ Wouldn't 30 seconds with an ohmmeter answer the question? \$\endgroup\$ – Edward Feb 5 '15 at 13:15
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No, there is no internal connection. One ground is Digital ground, the other Analog Ground, and they should be connected through an inductor capacitor circuit for best performance. I know this is a dupe of a Avr specific question I answered too

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